Siren

The Siren appears in the illuminated manuscripts of the abbey's scriptorium, most notably in the marginalia of the psalter illuminated by the young monk Adelmo of Otranto before his death. In these images, the Siren is depicted as a fowl with membranous wings, a hybrid creature that Jorge of Burgos, the blind guardian of orthodoxy, denounces as part of a "world reversed" where "dogs flee before the hare, and deer hunt the lion." For Jorge, such monstrous figures—sirens, centaurs, chimeras—are not harmless decorations but dangerous lies about the form of creation, showing the world as the opposite of what it should be. He argues that these "babewyn" (as William of Baskerville calls them, using the English term for such grotesques) corrupt the monk's mind, making it "more pleasurable for a monk to read marble than manuscript" and to admire the works of man rather than meditate on the law of God.

The Siren in the Scriptorium Debate

The Siren is a key example in the theological debate about laughter and the licitness of fantastic images that takes place in the scriptorium shortly before Adelmo's death. Venantius of Salvemec, the Greek scholar, defends such images by citing Aristotle's Poetics, arguing that metaphors and riddles—even those that depict monstrous hybrids—can reveal truth through distortion. He quotes Thomas Aquinas's teaching that divine things are better expounded in figures of "vile bodies" than noble ones, because such humbler depictions are more suited to human knowledge of God, who shows Himself "more in that which is not than in that which is." The Siren, as a figure that combines human and animal forms, exemplifies this principle of "dissimilar similitude"—the more the image differs from its subject, the more it forces the mind to seek the hidden truth. Jorge, however, rejects this entire line of reasoning, insisting that Christ never laughed and that such monstrous images lead only to pride and the loss of fear of God.

Narrative Role and Thematic Significance

The Siren functions within the novel as a symbol of the dangerous power of images and the seduction of forbidden knowledge. Like the lost second book of Aristotle's Poetics—which Jorge has hidden in the finis Africae and which he destroys to prevent its teaching on laughter from corrupting the world—the Siren represents a form of truth that operates through deception and inversion. The creature's hybrid nature mirrors the novel's own structure: a detective story that is also a philosophical novel, a historical reconstruction that is also a meditation on the nature of signs and interpretation. The Siren's song, which lures sailors to their destruction, is an apt metaphor for the library itself, which promises wisdom but, in Jorge's hands, becomes a labyrinth of concealment and death. In Adso's dream-vision of the Coena Cypriani, the Siren appears among the monstrous figures that populate the inverted world of the feast, a world where "everything is on the wrong path" and where the boundaries between the sacred and the profane, the human and the animal, are dissolved. The Siren thus embodies the novel's central anxiety: that the pursuit of truth through the senses and the intellect may lead not to salvation but to a beautiful, deadly error.